20046840 has 64 divisors (see below), whose sum is σ = 65612160. Its totient is φ = 4859520.

The previous prime is 20046839. The next prime is 20046841. The reversal of 20046840 is 4864002.

It is an interprime number because it is at equal distance from previous prime (20046839) and next prime (20046841).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20046840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20046841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6274 + ... + 8913.

It is an arithmetic number, because the mean of its divisors is an integer number (1025190).

Almost surely, 2^20046840 is an apocalyptic number.

20046840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20046840 is an abundant number, since it is smaller than the sum of its proper divisors (45565320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20046840 is a wasteful number, since it uses less digits than its factorization.

20046840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15212 (or 15208 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 20046840 is about 4477.3697636001. The cubic root of 20046840 is about 271.6535019821.

The spelling of 20046840 in words is "twenty million, forty-six thousand, eight hundred forty".